MC34708 datasheet(58/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

Table 45. SW4A/B Output Voltage Programmability

Set Point

SW4x[4:0]

SW4x

Output (V)

Set Point SW4x[4:0]

SW4x

Output (V)

00000

1.2000

10000

1.6000

00001

1.2250

10001

1.6250

00010

1.2500

10010

1.6500

00011

1.2750

10011

1.6750

00100

1.3000

10100

1.7000

00101

1.3250

10101

1.7250

00110

1.3500

10110

1.7500

00111

1.3750

10111

1.7750

01000

1.4000

11000

1.8000

01001

1.4250

11001

1.8250

01010

1.4500

11010

1.8500

01011

1.4750

01100

1.5000

01101

1.5250

01110

1.5500

01111

1.5750

Table 46. SW4A/B Electrical Specifications

Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C  TA  85 C, unless otherwise noted. Typical values

at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted.

Symbol

Characteristic

Min

Typ

Max

Unit

Notes

SW4A/B Buck Regulator

VSW4IN

Operating Input Voltage

• PWM operation, 0 < IL < IMAX

• PFM operation, 0 < IL < ILMAX

3.0

2.8

4.5

(51)

VSW4ACC

Output Voltage Accuracy

• PWM mode including ripple, load regulation, and transients

• PFM Mode, including ripple, load regulation, and transients

Nom-3%

Nom

Nom+3%

(50)

ISW4

Continuous Output Load Current, VINMIN < BP < 4.5 V

• PWM mode (separate)

• PWM mode single/dual phase

• PFM mode

500

1000

ISW4PEAK

Current Limiter Peak Current Detection

•VIN = 3.6 V Current through Inductor (separate)

• Current through Inductor

1.0

2.0

iSW4

TRANSIENT

Transient Load Change, 100 mA/µs

• Single/Dual Phase

• Separate

500

250

VSW4OS-

START

Start-up Overshoot, IL = 100 mA/µs

MC34708 Datasheet(PDF) 58 Page - Freescale Semiconductor, Inc

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